The importance of professional development days

This week I have three days of out of school professional days. Although it is hard to be away from the classroom for professional days, I feel they are important.
The first day is about a PBIS. This is our third year of PBIS and we are now learning how to implement tier three interventions. Without AEA support it is difficult to know and understand how these systems work.
The other two days of professional development are for using 21st century skills. These classes have given me so many ideas to use in the classroom.
It is so important that teachers keep learning new systems and new strategies to keep up with the most important thing. Students learning.